Shuttering ??? Need help

[240hatchsx]

I have a 93 hatch and recently been haveing an engine problem it starts fine and idle great and drives fine but just last week I've noticed that while driving that everytime I lush the clutch in the rpms drop down an start to bounce between 500-600 and when I come to a complete stop it goes back up to 1100 rpms and idles fine around there like it always has and I've just been too busy work on it so before I dive into on Saturday I figured I at least ask. Also new sparks, wires, o2 sensor and z32 fuel filter was changed a few months ago and I also just changed the oil last week as well


Thanks in advance
Patrick

[JamesBroChill42]

Check your IACV and all your vaccum lines also possibly your EGR. Essentially check all of your emissions stuff

[240hatchsx]

I checked most of the vaccum lines and the egr is not fully capped off but is plugged and it's still shuttering

[180sx91]

I would check your iacv remove it and clean it, it might help it did for me

[240hatchsx]

Quick question us the iacv located on the back if the intake manifold ???

[BCs300z]

I checked most of the vacuum lines and the egr is not fully capped off but is plugged and it's still shuttering

I would concur with the vacuum issue diagnosis. Sounds like a typical vacuum leak or potential IACV problem, which would cause the same. Other possible issue is power. Once the RPMs drop, and the alternator slows down significantly, your car may not be adjusting right away from whatever power pull you are making. This is possible but not probable.

[180sx91]

Quick question us the iacv located on the back if the intake manifold ???

Yes the iacv is on the back of your intake manifold, there is an L hose connected to it should make it a little easier to distinguish